Determination of the active state by the graphical, experimental and instantaneous methods in the frog ventricle.
D000818:Animals; D001001:Anura; D004548:Elasticity; D004558:Electric Stimulation; D006321:Heart / Q000502:physiology*; D066298:In Vitro Techniques; D008433:Mathematics; D008954:Models, Biological; D011898:Ranidae; D016276:Ventricular Function; D014783:Viscosity